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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'defeb6ca4cdbf0bdeacffa32eb29f4a5472faa8c4de2836729279d12272e95d2' 
  AND token = '+8j3HSrvHFp7eKYiaD7e9bq6Kansq/Tas1envr48YJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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