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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d9e3db2cdc555d7399134279fcab9180168cca9253cd18b4620e98532fbaba8' 
  AND token = '7iQB6Vmf5Oc0q1fUzW3Pae2M5isnZv1Ya6+VljHaEw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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