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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b177a9a4ce425aee3814e0051fac17e142c448bb2824b2828d83f9724e6d46a' 
  AND token = '0qxiuU3bt7IKKOxYCCVKstk3cYpdNK2fDJ11iQomRJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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