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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f16c142d3baa9d783fc705c498280ad39868e68023cdf21629a78d86d929929e' 
  AND token = '1v9mTch+06WIf8oi7qz20IzADXBkxra6ET23kNCs+ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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