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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '859de663af1a4b9e2660ea5130d35e60db1d172bc669da47a0f2cb1b47caa806' 
  AND token = 'vkd1yr4RY992RSUnibfo1ThbKv2oM1D2/FglGXlhgzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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