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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '172314da8c5b618f283c41138907ef17c93a73761421309fed8bbd805dcaa063' 
  AND token = 'I4ENYEt/UK544dbAYgRnP4bM5cTEFxJrli+YaSO/xzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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