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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0583556c8d7a948b380d08d9639db4792462dc01082d25f21da0a85564e95a9' 
  AND token = '6DQj9v3EOKfExws9KOg2XotQ9G5oZAl/ta67GAOnfDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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