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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16534c96a95c5a37fae2cc1d905199ef893c00c87db01c01f9040096ed6eb957' 
  AND token = 'XsAcDpW0vl/flW8eTP2sZ/XhtERPXhkcbAdAdEk3WLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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