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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '574c706f87ed4aac36eba79f7729d1ca1c73ad1cab85e6c759ae6b4adc6d1dad' 
  AND token = 'XiE2x/qjvcjF6yWTs8khpcVh1SNI4ETQYnw9ckDvBD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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