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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3686393420c3c143cd069f75209a12379dd536a43d2d61556b8a1048fc93dafb' 
  AND token = 'f+SwysyxEGExGOfPrvR/T8Y3IH89ld83X0882SiesPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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