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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0903090951e992aa9b6bcff9c71f56d0362bbc92091e34600fecca0bccb00412' 
  AND token = 'ccGFMFxLT8/puyH6a9n/0WuS9DqhAJ88bFLuqD5BMjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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