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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a7dd3c0b30c4474f9de6e4ce89927b3c5cccbb6de7640c488c7f620ca25803e' 
  AND token = 'dhfSGm9IZa4SQb1o8c0cJHBUNwKMkdv9H7ILBdom2eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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