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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d8777592b47c33c7c353497268709c5ba6a26b3aeac2ccf6a9807ed0972095' 
  AND token = 'mxpkS7NhIc5hk1OSufm775eJf74F3LL1cXpMtkgrz0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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