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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b7cb88808eb89ba780420c9bee05954435835d154a780ac77e4a86940aa0405' 
  AND token = 'agS9X9TOkaPOekgljDBO+MENJpk/74xivAcT3ia7t9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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