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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc54b4b02c1815c8effe79ab04d45fd6a54fa9ebb94fb48862bd37e0b4ebb50' 
  AND token = 'RTSxKrSNYzV66SvQFQRlFKDkLYxpcatbL6RlLg18ke0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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