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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe713334553d0494b61a01f534be5ce7ee148f24af36e4e5ebf5548f24ee1ad9' 
  AND token = '8TxG0w3TN/kSVp0ApK0gD+pB2/g0owNmQnOK5EodEFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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