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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b397ea2d3b566f3d0070a4d288ea52050e72ca2a71df3ac7a35f2894444734' 
  AND token = 'fT28O04F8aBg4xcjjyXnLqA9sreg18LnXb349suhexI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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