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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '544d11db52ef8bacc313fd242662c08825c24ab3b0da00e6166af204a61d9482' 
  AND token = 'TPDsHXeGGLjbIyOF84aiI9JjEHIbi3P4MVDDTQRNLKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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