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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab0d074afa8c2fa5c23f65dca450e104eee96fd81a7b573e7856704d2db3032' 
  AND token = '5O+p8m0WEu3O3VGsX9aLKKrNmd5L+71FEInbQMrLumg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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