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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16a3f31f5129ec155fa8a9a73173444fb6f7cd4a1b2d2c2f823ac0d491dd844f' 
  AND token = 'yxjuKINDltGMPB906xKcgxeyrJf01kkSwKs8dcK/SXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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