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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba933f0084ce546aaa6182ae00d4bf9bf1b1e5a97859fac980d1219bd5a96627' 
  AND token = 'ybM7nY5vuL/nLxDJiyjA5w3nyLyoSgWvO7ovgn4t06Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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