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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f44a02c3bca95e972bc8099d2349c7e6f4a3a6104031edb00bc145b8c49f12f9' 
  AND token = 'DnOR5DdguqmrsKV8ytnsQ2Mx9yhp4Au7ppOjeMGFaqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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