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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e866f81a1a75af56d294b8be15b2401b9c79b28250de048be22becdb56473f8e' 
  AND token = 'f1j/OrQCjIcGYUcL3WK0upLnziM/alESJzrrJ4Iv/Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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