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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1841265ae23c257923431d350f533318ec7710ef138b4e28aca6ceb7d5a06ee' 
  AND token = 'q0VzZJHNK4gjRgOLUGXAJXLSVnbxR517Cr+IHRMU1Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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