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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a3c865e4c960faf91d6e7d7f55761e9b9f09cc8878e7657c4dadc254b86fd9' 
  AND token = 'fUinEWbbae11lG/wMI2eFi0z9KHe71X6q2rCY5O3tZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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