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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d8c43e2aaa17cd38c7f28deead37be5112a58595e7f963c8d26274bb82a488a' 
  AND token = 'ICXTGmGvGuQ5Y3yTLsOoD4YMCWC0YEoqpjN8toaYqYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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