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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd903f417094f00f197fa516441109fc0ebaf0d89926f11f14764bcff4c73f586' 
  AND token = '9XcvgFsKPXYFwkMJ+k6pJ7cB0a9p3kZ8Th5yRqKFfoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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