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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f4d75ed6f7196042c251a2536014529a0fa45c9e4261679d9ef2451e4f0e688' 
  AND token = 'tFy81SHDhMnyps1w9IME6hI9yd1G3tfNWMi7sVXZkKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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