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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4333d401a605799e3248d62daf3ef8a03f1fc5721c35ecbae80e0826ab875f0' 
  AND token = 'VaOONu0bAxFlFfTvHBhn5do3bc7AhduzKopzNQS84hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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