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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd018b4a1465cecc84999e24c7ddcffa4c9f399a3b77d4fc06b5a68a2fc1bbe86' 
  AND token = 'DLUF8xRdqZg1hbb9mOxK5ovxXrDir+ip89EweXnt6LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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