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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '914cd87985185e419e434e01d05d5ae7dd26bc3deb77a22417c0f5d4380f7876' 
  AND token = '/sy6juwdnhkvnVUar1RZHqFXBcrmowsgdm7ZiqF9km8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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