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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53e5659c20d7220138fd04bb6ef49cc9afdd7ca25a92901d5374b1d48dd71299' 
  AND token = 'cF1AOiB1zO5zbUmo00WA8lpcBVavYIxOxAAWFqN/9nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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