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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d1243e18c1c5be1fe19a6d191db08db4ff2fe94a9adabdce18bfbf50f9d610' 
  AND token = 'vq12c8D4J4QW9EsY01lWcs2Zqd/tP/Jg0oJ9lF752l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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