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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25266ba4295aa8575bc0bd3fc6764cdaf2c300ee4dfc46ec374c96069f097cd6' 
  AND token = 'SrWPdhqxTVar7AdY/JRaGV5Mtezo2hf4Euj9uGt1his=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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