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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cffa6b2e4c0ee4bd87914e1167270190323a6c99aea88a619bdc1f92a7abdd1' 
  AND token = 'o9LQ7sELY28vyqVGsnc8f0l6CVpvsHYtYFX6Mh4MMaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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