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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '722b5d0ed13d723c6081a2a7d8963c28b96e988f9b32fc7208adfef91c8e09e9' 
  AND token = 'FEBttKFn+oW1rjC+v2AiziM3pq8d1hO/QfYFwqv30Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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