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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5911e467cf7486545280ca4a0951d345b061fdd3c5f677225ad1cdc5849bd2cf' 
  AND token = 'xNTAOL4tZ+3GNv/RrPaoUKfK07n+iryEnC+Ov2/ksaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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