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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50526d62f30c758b73059b56d4aa7d8f869166ae0bd0eda6bc57423b13d070a7' 
  AND token = 'IJo0nzvUZkrU+Gaai/sO7FGryeiRx4ilGXA7KseiUog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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