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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb0c6ffd48cbc17e7ecc921dcca1af691b1b492fbce0a2c989adc9ad9481374' 
  AND token = 'uV9VrkUIjFiFBdJ5qcoLOhvfzP2c+GXSiX7dsrVZtN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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