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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e9b1391ad2e12b6f37ec6d56791bfcd6f623dd731b8dcc93f47f72a736434c7' 
  AND token = 'bS84m8olxis4/j4GE/Gz1v6LIyGiWGrwhRRmIs4g1zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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