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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f72dcacb9b3f0eb0bbb808deacb2ad406f443e2cf3ee9e64fd8c6707b5c3de8d' 
  AND token = 'nWa+Wvgwoizpj/AEMoOAjCnxyyQ2KIPrU9JyTACgIl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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