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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7341d99e7b4ffdd4a7923b38120e984b7ff5ac301ae76eb0b6497452269ba4be' 
  AND token = 'DNWTvd4W1MFJK5cQ0MybjouS7qt28g5e7QaO/6AGmdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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