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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6d12d0e7277a3df58b88e583a8b05d3d28b7bef1d69ade2d6fa50e984c6f306' 
  AND token = 'nYdtpXiF1MZn5vyKdCuZnRNHpMx/kLNePZgpoJQnh40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}