SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7670ef7532501972b13264f019604d66bbae4962b2931fc7aa04010d3b01b464' 
  AND token = '7wy1ZeJKCtM5Fgi+B51AjR8x8/3fP6z7meTUjlc+RhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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