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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '520a0bf9020d2b48d25c9472854db248c75fe5e4249e6194ee21a2c54072eae6' 
  AND token = 'kkiOzPH7Ol0ddTnaBtNe/9pgWWnHaovohSnkV85f66U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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