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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb4da71445d1c86fc58a94c75f0036c0768ad61bb37c79b017b358b9db24784' 
  AND token = 'faNZWaUa+P2thKDYjO97XoQECva1jWR7PhacVysiGgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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