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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbfa48a4a0817593097d7c003347a5d0c2cc85f0ba0eff0734b55aca66402fc7' 
  AND token = 'hSNDZJ6W74WxUMylcvVNzql8SYlGV5cLrdgLpJqa60c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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