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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afa7e93a0c5b89b6b8b62cad68bbd9609aac9b939aa8e11fd72c82e7b7496c15' 
  AND token = 'I1JiMQOidwaQY3KT4YpOtm5LuIlsgfNQ9JDrpR7gH/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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