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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dde0e593e3e7af25694046cd06db784ce4b08a33020c87d34ab73a0dc98b293' 
  AND token = 'pDKXBT+XqwM3vg/CVhD918URIcVFHtbOyYMKcmOAV2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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