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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada6c87eff72a318467a9d89801780eb932386c0305727e16e4f44e0bec590cc' 
  AND token = 'rU1nES1ALeOB23BGMNer5UkU2cGob14fjDbyb8u5scE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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