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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd79df0a0979c24d07d78dcc1f926edc14dc6a52836af450e641069e097d9605' 
  AND token = 'xSeZ/xhBK07y7Dt69UteuvB5VTgi1vn6AYG7Q9K2DEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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