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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e293d58c7d08efaef0af417cfdd054ae1db19a82978e2a30ed497a93380b8b' 
  AND token = 'VoJ5YRvR5IVzvgHC8pUHn0ifdKC9ihqOA99jKW8EGD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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