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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2817a4f78743e91f31bc6c837b7e33245bb4f72c9772d4f66588a6bb76694d8' 
  AND token = 'fY3hz1suYaTySNL5kgo707d5Kr1tV9vCzcllCvigXA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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