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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd8a6ccf590f5e53a3fc5ab0e447cb367b92b542614cdfe0b88376c6efaceb6' 
  AND token = 'ukKQtFkB6LZm8+Vy2pt37J9LhoTMjgda3tBIN+5i3Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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