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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd07a8b46981f0302e63c47de080ebaf11099bdb8e1c8d2b8ead0ad0ff624998c' 
  AND token = 'uPI1U8oFvWpS83VSx4qq7cp99x7uFklryRHrIqRFzak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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