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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c61d7943313ec8ba23f9752fee4d338d130588488c220c28228509184c242386' 
  AND token = 'HsV/sd5+y8DHScQn3RQ/ffZ/ctRuX+4YCe1hDexqq1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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